15 Questions
What is the unit of magnetic flux?
Weber
What is the direction of magnetic field determined by?
Right Hand Rule
What is the magnetic field intensity (H) proportional to?
Number of turns and current
What is the line integral of the magnetic field intensity (H) around a closed path equal to?
Current enclosed
What is the relation between mmf and magnetic field intensity (H)?
mmf = N i / l
What is the relation between the magnetic field intensity H and the magnetic flux density B?
B = μH
What is the unit of magnetic flux density?
Tesla
What is the purpose of the magneto-motive force F?
To set up the magnetic flux lines within the magnetic material
What is the relation between the reluctance ℜ and the permeability μ?
ℜ = l/μA
What is the effect of saturation on the magnetic material?
The change of B is non-linear at higher values of H
What is the purpose of the magnetization curve?
To show the relation between the magnetic field intensity and the flux density
What are the two kinds of power losses that occur in a magnetic material during cyclic magnetization?
Hysteresis loss and eddy current loss
What is the unit of the magneto-motive force F?
Ampere-turn
What is the relation between the magnetic flux Φ and the magnetic flux density B?
Φ = BA
What is the purpose of the reluctance ℜ in a magnetic circuit?
To oppose the magnetic flux
Test your knowledge of magnetic circuits, including the magnetic field, right-hand rule, and types of transformers such as single-phase, three-phase, and auto-transformers. Review eddy and hysteresis losses and Scott connection transformers.
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